- Add Op to handleOP func signature

- Add PushNBytes OPcode

pkg/vm/vm.go

@@ -26,11 +26,12 @@ func NewVM(script []byte) *VM {
 
 // ExecuteOp will execute one opcode for a given context
 func (v *VM) ExecuteOp(op stack.Instruction, ctx *stack.Context) error {
+
 	handleOp, ok := opFunc[op]
 	if !ok {
 		return fmt.Errorf("unknown opcode entered %v", op)
 	}
-	err := handleOp(ctx, &v.InvocationStack)
+	err := handleOp(op, ctx, &v.InvocationStack)
 	if err != nil {
 		return err
 	}

pkg/vm/vm_ops.go

@@ -2,7 +2,15 @@ package vm
 
 import "github.com/CityOfZion/neo-go/pkg/vm/stack"
 
-var opFunc = map[stack.Instruction]func(ctx *stack.Context, istack *stack.Invocation) error{
+var opFunc = map[stack.Instruction]func(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation) error{
 	stack.ADD:         Add,
 	stack.SUB:         Sub,
+	stack.PUSHBYTES1:  PushNBytes,
+	stack.PUSHBYTES75: PushNBytes,
+}
+
+func init() {
+	for i := int(stack.PUSHBYTES1); i <= int(stack.PUSHBYTES75); i++ {
+		opFunc[stack.Instruction(i)] = PushNBytes
+	}
 }

pkg/vm/vm_ops_maths.go

@@ -7,7 +7,7 @@ import (
 // Add adds two stack Items together.
 // Returns an error if either items cannot be casted to an integer
 // or if integers cannot be added together
-func Add(ctx *stack.Context, istack *stack.Invocation) error {
+func Add(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation) error {
 
 	operandA, operandB, err := popTwoIntegers(ctx)
 
@@ -24,7 +24,7 @@ func Add(ctx *stack.Context, istack *stack.Invocation) error {
 // Sub subtracts two stack Items.
 // Returns an error if either items cannot be casted to an integer
 // or if integers cannot be subtracted together
-func Sub(ctx *stack.Context, istack *stack.Invocation) error {
+func Sub(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation) error {
 
 	operandA, operandB, err := popTwoIntegers(ctx)
 

pkg/vm/vm_ops_stackmani.go

@@ -0,0 +1,19 @@
+package vm
+
+import (
+	"github.com/CityOfZion/neo-go/pkg/vm/stack"
+)
+
+// Stack Manipulation Opcodes
+
+// PushNBytes will Read N Bytes from the script and push it onto the stack
+func PushNBytes(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation) error {
+
+	val, err := ctx.ReadBytes(int(op))
+	if err != nil {
+		return err
+	}
+	ba := stack.NewByteArray(val)
+	ctx.Estack.Push(ba)
+	return nil
+}